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Gaming is not blazingly fast, but Quake Live should be fine. It certainly works, and is more than playable.

In general, expect a fraction of the binary driver's 3d performance (1/3, maybe) when using the open drivers. However, the free drivers shine at 2d, XVideo, xrandr support and general stability. Most native stuff will run, WINE stuff is more problematic.

There is no video playback acceleration for the free drivers comparable to VDPAU at the moment. Some solution based on shaders will eventually appear, but there is little usable code right now. XvMC is just becoming usable with the r600g driver, and that's just MPEG2 for now. But it should lead to better things in the future.

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Recent r300g results are very positive, though, in some games it has even reached parity with fglrx, according to some posts on here.

So I think that 75% of the blob is reachable with enough time and effort. And some of these optimisations will benefit all drivers, as they deal with shared components. And 75% of the blob would be good enough for pretty much everybody.

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6xx/7xx/Evergreen 3D boxes are all marked "MOSTLY" (ie implemented with known bugs) except for the just-added GL3/GL4 feature rows (eg geometry shaders) and performance enhancements like texture tiling. The transition from "MOSTLY" to "DONE" is always slow because there is no clear rule for when the transition should happen.

The WIP entries are for Northern Islands not Evergreen. Only one of the NI models has even been released...